In reviewing our forums I noticed this post did not update with the rest of Rami's story, which was concluded privately in his support ticket.

The problem, such as it were, turned out to be that his USB Cellular modem had some internal capacitors that held the power rails up while the power management chip was attempting to perform the reset function.

The solution in this case is to deliberately turn off USB power before issuing the reboot command. This causes power to be physically cut from the USB ports, shielding the internal power rail from the external device's pull.

Michael Peters

said
10 months ago

Answer

In reviewing our forums I noticed this post did not update with the rest of Rami's story, which was concluded privately in his support ticket.

The problem, such as it were, turned out to be that his USB Cellular modem had some internal capacitors that held the power rails up while the power management chip was attempting to perform the reset function.

The solution in this case is to deliberately turn off USB power before issuing the reboot command. This causes power to be physically cut from the USB ports, shielding the internal power rail from the external device's pull.